Drying apparatus and method of drying.



J. 0. ROSS.

DRYING APPARATUS AND METHOD OF DRYING.

APPLICATION FILED one. m3.

1,287,1 10. Patented Dec. 10, 1918.

7 41 h L. M1 L| n\: \1 n\ 15 i i z z z i 12 13 f T P r F r! Ii ll J 1! II II n r13 Jul/39106021- AQQ4M 6Q MW W //Zk JOHN o. noss, or. BOSTON,

MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO B. F. STURTE- VANT COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHU- SETTS.

DRYING APPARATUS AND METHOD OF DRYING. j

Specification of Letters Patent.

Patented Dec. 10, 1918.

Application filed December a, 1913. Serial 110,805,429.

I To all whom it may concern:

s such apparatus.

carried through the apparatus,

Be it known that I, JOHN 0. Ross, a citizen of the United States, residing at Roslindale, Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Drying Apparatus and Methods of Drying; and I do hereby declare the following to be a full, clear, and exact description of the in-' vention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to drying and more particularly to apparatus for drying webs of paper, fabric or the like. The apparatus is particularly applicable for drying webs of material of indeterminate length which are passed continuously through the drying apparatus, such as, for example, the partially dried paper coming from a paper making machine, or the paper coming from a paper coating machine, or fabric coming from a fabric coat- I ing, printing or bleachingmachine.

In drying a web of molst paper or fabric there is a tendency for the web to dry more rapidly at the edges of the web than at its middle portion. In order to compensate for this tendency of unequal drying, the pres ent invention contemplates an apparatus in which air is blown against the middle of the web so as to cause the web to be dried substantially equally throughout its width. The present invention. also relates to the method of drying which is carried out by In the drawings, which illustrate the preferred embodiment of the apparatus of the present invention,'Figure 1 is a side elevation of theapparatus; Fig. 2 is a vertical section taken along the line 2-2 of Fig. 1; and Fig. 3 is a bottom plan view showing the air nozzles.

In the illustrated apparatus the web 1 15 of indeterminate length and is continuously drying apparatus by means of a suitable festooning'apparatus. This festooning apparatus is indicated by the rods 2 which support the web in festoons orloops. The rods 2 are moved tinuously to the right in Fig. 1, so as to supply the moist web to the drying apparatus and take it away as it is dried. Such festooning apparatus is old and well known conin this art and need not be described in detail.

The apparatus for supplying the drying air comprises a blower 10, a heater 11 and a conduit 12 havin a number of downwardly directed tubu ar nozzles 13 above the festooning apparatus. The heater 11 ma be of any suitable type of air heater, pre er-ably one in which the air passes over coils of steam pipes 14 so that dry heated air is blown through the conduit 12. The conduit 12 extends longitudinally over the middle of the festooning apparatus. In the bottom of the conduit 12, directly over the middle of the web as it is supported on the festooning apparatus, are the nozzles 13 which consist of short downwardly extending collars of substantially rectangular cross section. On the inside of the conduit are a number of deflector plates 15 which serve to deflect the air into-the nozzles 13; As shown in Fig. 1, the deflectors for the nozzles over the first part of the festooning apparatus are straight, so that the air will be discharged substantially downwardly and will not tend to blow the loops along, while the deflectors for the nozzles over the last part of the festooning apparatus are inclined, as there is not the same objection to blowing the loops along the festooning apparatus.

The dry heated air from the nozzles 13 is blown down into the middle of the web and flows laterally over the top of the material and off at its sides. Since the air coming from the nozzles is first applied to the middle of the web, it will tend to dry the middle of the web most rapidly, and will thus counteract the tendency which it would otherwise have to-dry the edges more rapidly than at the middle.

It will be understood that with this construction the web of paper or other material portions of the web to dry faster than the the drying eifect,

central portions is neutralized and a uniform drying of the web of paper across the entire width is obtained.

The present invention is not limited to the illustrated embodiment but may be embodied in other apparatus and methods within the scope of the invention as particularly pointed out in the following claims.

I claim 1. An apparatus for drying webs of paper or fabric having, in combination, a conveyor for carrying the web, a blower, an air conduit extending longitudinally along the web and a tubular nozzle for discharging a well defined stream of air from said conduit which impinges against the middle portion only of the web in order to counteract the tendency which thefweb would otherwise have to dry more rapidly at the edges than at the middle.

2. The method of drying webs of paper or fabric which consists in directing a welldefined stream of air in such a manner that it impinges against the middle portion only of the moving web and flows laterally from the middle portion to opposite edges of the web to cause a uniform drying of the web across its entire width.

3.; An apparatus for drying webs of padlc, and deflectors in the conduit for deflecting the air into the nozzles.

r. An apparatus for drying webs of paper or fabric having, in comblnation, a conveyer for carrying the web. and means for deli 'ering drying air against the web including a blower, a conduit, nozzles which are arranged to direct well-defined streams,

of air against the middle portion only of the web in order to counteract the tendency which the web would otherwise have to dry more rapidly at the edges than at the middle, and deflector plates in the conduit for deflecting the air into the nozzles, said deflector plates being set at different angles in different parts of the conduit.

JOHN O. ROSS. Witnesses:

HORACE VAN EVEREN, Geo. E. STEBBINS. 

